I am trying to push forward with Amsoil on this one. In this case...the Durango was new, does easy miles, and puts over 50K a year on. The oil is getting used oil analysis by Amsoil and is using the Eao full-flow. Oil usage is Zero between oil changes. The first oil change results were good, but the oil did not make it even to 13K. The second oil change did not make it to 15K without being abnormal.
The oil thickened to a 50 weight. Everything else was in the acceptable range. Amsoil at this point is leaning toward "sodium" contamination and say's it will push up the viscosity. I just don't buy it. The claim is 15K severe duty or 25K or 1year...which ever comes first. This promise is just not happening anymore.